MAYBE
324.41/82.16	MAYBE
324.41/82.16	
324.41/82.16	Problem:
324.41/82.16	 active(nats()) -> mark(cons(0(),incr(nats())))
324.41/82.16	 active(pairs()) -> mark(cons(0(),incr(odds())))
324.41/82.16	 active(odds()) -> mark(incr(pairs()))
324.41/82.16	 active(incr(cons(X,XS))) -> mark(cons(s(X),incr(XS)))
324.41/82.16	 active(head(cons(X,XS))) -> mark(X)
324.41/82.16	 active(tail(cons(X,XS))) -> mark(XS)
324.41/82.16	 active(cons(X1,X2)) -> cons(active(X1),X2)
324.41/82.16	 active(incr(X)) -> incr(active(X))
324.41/82.16	 active(s(X)) -> s(active(X))
324.41/82.16	 active(head(X)) -> head(active(X))
324.41/82.16	 active(tail(X)) -> tail(active(X))
324.41/82.16	 cons(mark(X1),X2) -> mark(cons(X1,X2))
324.41/82.16	 incr(mark(X)) -> mark(incr(X))
324.41/82.16	 s(mark(X)) -> mark(s(X))
324.41/82.16	 head(mark(X)) -> mark(head(X))
324.41/82.16	 tail(mark(X)) -> mark(tail(X))
324.41/82.16	 proper(nats()) -> ok(nats())
324.41/82.16	 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2))
324.41/82.16	 proper(0()) -> ok(0())
324.41/82.16	 proper(incr(X)) -> incr(proper(X))
324.41/82.16	 proper(pairs()) -> ok(pairs())
324.41/82.16	 proper(odds()) -> ok(odds())
324.41/82.16	 proper(s(X)) -> s(proper(X))
324.41/82.16	 proper(head(X)) -> head(proper(X))
324.41/82.16	 proper(tail(X)) -> tail(proper(X))
324.41/82.16	 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2))
324.41/82.16	 incr(ok(X)) -> ok(incr(X))
324.41/82.16	 s(ok(X)) -> ok(s(X))
324.41/82.16	 head(ok(X)) -> ok(head(X))
324.41/82.16	 tail(ok(X)) -> ok(tail(X))
324.41/82.16	 top(mark(X)) -> top(proper(X))
324.41/82.16	 top(ok(X)) -> top(active(X))
324.41/82.16	
324.41/82.16	Proof:
324.41/82.16	 Open
324.41/82.16	EOF